LONDON, June 19 (Xinhua) --- Chinese Premier Li Keqiang left here for Greece on Thursday, wrapping up a fruitful visit to Britain which witnessed the signing of a series of cooperation deals worth 30 billion U.S. dollars.

During his four-day trip, Li held in-depth talks with British leaders including Queen Elizabeth II and Prime Minister David Cameron, exchanging views on advancing bilateral ties and practical cooperation.

This year marks the 10th anniversary of the establishment of the China-Britain comprehensive strategic relationship. The two countries pledged to seize the opportunity to lift bilateral relations to a new level.

The Chinese premier also attended a Britain-China Financial Forum, co-chaired a global economic roundtable with Cameron and made a speech at a gathering hosted by two prestigious British think tanks, among others.

It was Li's first trip to Britain as premier, and another major diplomatic event between China and Europe following President Xi Jinping's visit to the continent in late March.